(Delphi ActiveX) File Existence Check

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
success: Integer;
fileSize: Integer;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

ftp := TChilkatFtp2.Create(Self);

ftp.Hostname := 'ftp.example.com';
ftp.Username := 'username';
ftp.Password := 'password';

// Connect and login to the FTP server.
success := ftp.Connect();
if (success <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

// Set the current remote directory to where the file is located:
success := ftp.ChangeRemoteDir('something');
if (success <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

// Test to see if the file exists by getting the file size by name. 
// If a -1 is returned, the file does not exist.
fileSize := ftp.GetSizeByName('test123.txt');
if (fileSize < 0) then
  begin
    Memo1.Lines.Add('file does not exist');
  end
else
  begin
    Memo1.Lines.Add('file exists and is ' + IntToStr(fileSize) + ' bytes in size');
  end;

success := ftp.Disconnect();
end;